A company gives each worker a cash bonus every Friday, randomly giving a worker an amount with these probabilities: $10 0.9, $50 0.1. Over many weeks, what is a worker's expected weekly bonus?
( i already have my answer but i wasn't sure if it was right or not)

(10 + 50) / 2 = $30

10×0.9 + 50×0.1 = $14

(10×0.9 + 50×0.1) / 2 = $7

(10 + 50) / 10 = $6

Tomas is making trail mix using granola and walnuts. he can spend a total of $12 on the ingredients. he buys 3 pounds of granola that costs $2.00 per pound. the walnuts cost $6 per pound. he uses the equation to represent the total cost, where x represents the number of pounds of granola and y represents the number of pounds of walnuts. he solves the equation for y, the number of pounds of walnuts he can buy. answer- b tomas added 6 to both sides of the equation instead of subtracting 6. just took the test

Three times the sum of a number and seven is negative thirty-six. what is the number?

The square root of 9x plus 7 plus the square rot of 2x equall to 7